module.exports = {


  friendlyName: 'Create android signup url',


  description: 'Creates and returns a signup URL for an android enterprise.',


  inputs: {
    callbackUrl: {
      type: 'string',
      required: true,
    }
  },


  exits: {
    success: { description: 'A signup URL has been sent to the requesting Fleet server.'},
    missingOriginHeader: { description: 'The request was missing an Origin header', responseType: 'badRequest'},
    enterpriseAlreadyExists: { description: 'An Android enterprise already exists for this Fleet instance.', statusCode: 409 },
    invalidCallbackUrl: { description: 'The provided callbackUrl could not be used to create an Android enterprise signup URL.', responseType: 'badRequest'}
  },


  fn: async function ({ callbackUrl }) {


    // Parse the Fleet server url from the origin header.
    let fleetServerUrl = this.req.get('Origin');
    if(!fleetServerUrl){
      throw 'missingOriginHeader';
    }

    // Check the database for an existing record for this Fleet server.
    let connectionforThisInstanceExists = await AndroidEnterprise.findOne({fleetServerUrl: fleetServerUrl});
    if(connectionforThisInstanceExists) {
      // Before throwing conflict, verify the enterprise still exists in Google
      // If it doesn't exist, clean up the stale proxy record and continue with signup
      let isEnterpriseManagedByFleet = await sails.helpers.androidProxy.getIsEnterpriseManagedByFleet(connectionforThisInstanceExists.androidEnterpriseId);
      if(isEnterpriseManagedByFleet) {
        // Enterprise still exists in Google - throw conflict
        throw 'enterpriseAlreadyExists';
      } else {
        // Enterprise not found in LIST - clean up stale proxy record
        await AndroidEnterprise.destroyOne({ id: connectionforThisInstanceExists.id });
        // Continue with signup process (don't throw conflict)
      }

    }


    // Get a signup url for this Android enterprise.
    // Note: We're using sails.helpers.flow.build here to handle any errors that occurr using google's node library.
    let signupUrl = await sails.helpers.flow.build(async ()=>{
      let { google } = require('googleapis');
      let androidmanagement = google.androidmanagement('v1');
      let googleAuth = new google.auth.GoogleAuth({
        scopes: ['https://www.googleapis.com/auth/androidmanagement'],
        credentials: {
          client_email: sails.config.custom.androidEnterpriseServiceAccountEmailAddress,// eslint-disable-line camelcase
          private_key: sails.config.custom.androidEnterpriseServiceAccountPrivateKey,// eslint-disable-line camelcase
        },
      });
      // Acquire the google auth client, and bind it to all future calls
      let authClient = await googleAuth.getClient();
      google.options({auth: authClient});
      // [?] https://googleapis.dev/nodejs/googleapis/latest/androidmanagement/classes/Resource$Signupurls.html#create
      let createSignupUrlResponse = await androidmanagement.signupUrls.create({
        // The callback URL that the admin will be redirected to after successfully creating an enterprise. Before redirecting there the system will add a query parameter to this URL named enterpriseToken which will contain an opaque token to be used for the create enterprise request. The URL will be parsed then reformatted in order to add the enterpriseToken parameter, so there may be some minor formatting changes.
        callbackUrl: callbackUrl,
        // The ID of the Google Cloud Platform project which will own the enterprise.
        projectId: sails.config.custom.androidEnterpriseProjectId,
      });
      return createSignupUrlResponse.data;
    }).intercept({status: 400}, (unusedErr)=>{
      return {'invalidCallbackUrl': 'The provided Callback Url could not be used to create an Android enterprise signup URL.'};
    }).intercept({status: 429}, (err)=>{
      // If the Android management API returns a 429 response, log an additional warning that will trigger a help-p1 alert.
      sails.log.warn(`p1: Android management API rate limit exceeded!`);
      return new Error(`When attempting to create a singup url for a new Android enterprise, an error occurred. Error: ${err}`);
    }).intercept((err)=>{
      return new Error(`When attempting to create a singup url for a new Android enterprise, an error occurred. Error: ${err}`);
    });


    return {
      url: signupUrl.url,
      name: signupUrl.name,
    };



  }


};
